chore: import upstream snapshot with attribution

apps/sim/tools/mailgun/get_mailing_list.ts

@@ -0,0 +1,61 @@
+import type { GetMailingListParams, GetMailingListResult } from '@/tools/mailgun/types'
+import type { ToolConfig } from '@/tools/types'
+
+export const mailgunGetMailingListTool: ToolConfig<GetMailingListParams, GetMailingListResult> = {
+  id: 'mailgun_get_mailing_list',
+  name: 'Mailgun Get Mailing List',
+  description: 'Get details of a mailing list',
+  version: '1.0.0',
+
+  params: {
+    apiKey: {
+      type: 'string',
+      required: true,
+      visibility: 'user-only',
+      description: 'Mailgun API key',
+    },
+    address: {
+      type: 'string',
+      required: true,
+      visibility: 'user-or-llm',
+      description: 'Mailing list address to retrieve (e.g., newsletter@mg.example.com)',
+    },
+  },
+
+  request: {
+    url: (params) => `https://api.mailgun.net/v3/lists/${params.address}`,
+    method: 'GET',
+    headers: (params) => ({
+      Authorization: `Basic ${Buffer.from(`api:${params.apiKey}`).toString('base64')}`,
+    }),
+  },
+
+  transformResponse: async (response, params): Promise<GetMailingListResult> => {
+    if (!response.ok) {
+      const error = await response.json()
+      throw new Error(error.message || 'Failed to get mailing list')
+    }
+
+    const result = await response.json()
+
+    return {
+      success: true,
+      output: {
+        success: true,
+        list: {
+          address: result.list.address,
+          name: result.list.name,
+          description: result.list.description,
+          accessLevel: result.list.access_level,
+          membersCount: result.list.members_count,
+          createdAt: result.list.created_at,
+        },
+      },
+    }
+  },
+
+  outputs: {
+    success: { type: 'boolean', description: 'Whether the request was successful' },
+    list: { type: 'json', description: 'Mailing list details' },
+  },
+}